ms;EASES OF TTTK I^KIESiTlVK TRA("r 113 



tccntli (lay. Tlic most critical jx'i-iod ])('«,niis a1 al)()ut the 

 tlii?-ly-fit'(li (lay at'tci- liatcliinu-. V()un«,' poults are ol)sorved 

 to he sick no more than four to six (hiys. While old hii-ds 

 may i-ccovci". youuir hirds |)rol)al»ly never do. 



Report of a Case of Blackhead 



Of eleven turkeys of the flock, six had died. One of the turkeys 

 was brought to the laboratory for further study. The turkey's 

 head was purple: there was a loss of appetite: a diarrhea was 

 present and the dischai'se was yellowisli-green in color. A blood 

 study showed the following: Hemoglobin. 73 per cent; erythroc vtes, 

 2.000.000: leukocytes, 73,000. Differential count: eosinophiles, 86 

 per cent: neuthrophiles. 1 per cent; lymphocytes, n per cent: mo- 

 nonuclears, 1 per cent; mast cells, 1 per cent. The bird died and an 

 autopsy was held. The following is a summary of the findings: 



A^^ 



^-B 



Fig. 46. Cloudy Swelling Due to E.nterohepatitis. 



This Is a Section From "B" in Fig. 66. 



(Magnified 990 Times). 



A, liver cells (cloudy swelling); B, liver cells un- 

 dergoing disintegration, necrosis; C, congested blood 

 vessel; D, white blood cells, eosinophiles abundant in 

 this disease; E, protozoa causing the disease. 



Xecrotic areas in the liver measuring up to four centimeters in 

 diameter and of a yellowish-green color. Weight of the liver, 452 

 grams. 



Ulceration of one cecum, four centimeters from the cecal end 

 and extending three cm. in length. The outer surfaces of the ceca 

 showed yellowish-green coloration. There was edema in the peri- 

 cardial region. 



Trtaimful. — 'rh()rou«ih clcauinj;- of henhouse and yard, fol- 

 lowed hy careful disinfection; care as to feeding' and waterin«r, 

 and intestinal antiseptics are indicated a.s reconnnended for 

 fowl cholera. Tlie followinfr tablets jrave the best results in 

 our experiments: Sodium sul|)hoearl)olate, T^/o grains; cal- 

 cium sulphoearbolate, TV-.' grains; zinc sulphocarbolate, 15 



